Chore: Android: Compile Whisper with support for 16 KB pages (#13118)

.github/workflows/build-android.yml

@@ -40,4 +40,29 @@ jobs:
           cd packages/app-mobile/android
           sed -i -- 's/signingConfig signingConfigs.release/signingConfig signingConfigs.debug/' app/build.gradle
           ./gradlew assembleRelease
-          
+      
+      - name: Verify alignment
+        run: |
+          cd packages/app-mobile/android/app
+          APK_FILE="./build/outputs/apk/release/app-release.apk"
+          if test ! -f "$APK_FILE" ; then
+            echo "APK file not found."
+            exit 1
+          else
+            echo "APK file found at: $APK_FILE"
+          fi
+
+          BUILD_TOOLS_PATH="$ANDROID_HOME/build-tools/"
+          if test ! -d "$BUILD_TOOLS_PATH" ; then
+            echo "Build tools not found at $BUILD_TOOLS_PATH ($ANDROID_HOME, $BUILD_TOOLS_VERSION)"
+            exit 1
+          fi
+          # The build-tools/ directory contains different subdirectories
+          # for each build tools version. As a result, there may be multiple
+          # zipalign tools. Select one of them:
+          ZIPALIGN_PATH="$(find $BUILD_TOOLS_PATH -name "zipalign" -print | head -n1)"
+          if test ! -x "$ZIPALIGN_PATH" ; then
+            echo "zipalign not found (searching in $BUILD_TOOLS_PATH, candidate: $ZIPALIGN_PATH)"
+            exit 1
+          fi
+          "$ZIPALIGN_PATH" -c -P 16 -v 4 "$APK_FILE"

packages/app-mobile/android/app/build.gradle

@@ -100,6 +100,8 @@ android {
         externalNativeBuild {
             cmake {
                 cppFlags '-DCMAKE_BUILD_TYPE=Release'
+                // For 16 KB pages. This should be removable after upgrading to NDK r28
+                arguments "-DANDROID_SUPPORT_FLEXIBLE_PAGE_SIZES=ON"
             }
         }
     }

packages/app-mobile/android/app/src/main/cpp/CMakeLists.txt

@@ -38,8 +38,9 @@ add_library(${CMAKE_PROJECT_NAME} SHARED
 set(WHISPER_LIB_DIR ${CMAKE_SOURCE_DIR}/../../../../vendor/whisper.cpp)
 
 # Based on the Whisper.cpp Android example:
-set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS}   -O3 ")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O3 -fvisibility=hidden -fvisibility-inlines-hidden -ffunction-sections -fdata-sections")
+set(SHARED_FLAGS "-O3 ")
+set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS}   ${SHARED_FLAGS} ")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${SHARED_FLAGS} -fvisibility=hidden -fvisibility-inlines-hidden -ffunction-sections -fdata-sections")
 
 # Whisper: See https://stackoverflow.com/a/76290722
 add_subdirectory(${WHISPER_LIB_DIR} ./whisper)